vendor: support native TypeScript source loading

vendor/schemastery/tsdown.config.ts

@@ -1,10 +1,9 @@
 import { defineConfig } from 'tsdown'
 
 /**
- * schemastery has no `"type": "module"` and publishes dual-format output
- * (package.json: main → lib/index.cjs, module → lib/index.mjs). The entry is
- * the JS emitted by tsc under lib/types; pin the bundled extensions
- * explicitly because the defaults for a CommonJS package would emit .mjs/.js.
+ * Schemastery publishes dual-format output (package.json: main → lib/index.cjs,
+ * module → lib/index.mjs). The entry is the JS emitted by tsc under lib/types;
+ * pin the bundled extensions explicitly so the package retains both formats.
  */
 export default defineConfig({
   entry: ['lib/types/index.js'],